#ifndef SRC_BASE_ASYNCRESOLVERINTERFACE_H_
#define SRC_BASE_ASYNCRESOLVERINTERFACE_H_

#include "base/sigslot.h"
#include "base/socketaddress.h"

namespace vz {

// This interface defines the methods to resolve the address asynchronously.
class AsyncResolverInterface {
 public:
  AsyncResolverInterface() {}
  virtual ~AsyncResolverInterface() {}

  // Start address resolve process.
  virtual void Start(const SocketAddress& addr) = 0;
  // Returns top most resolved address of |family|
  virtual bool GetResolvedAddress(int family, SocketAddress* addr) const = 0;
  // Returns error from resolver.
  virtual int GetError() const = 0;
  // Delete the resolver.
  virtual void Destroy(bool wait) = 0;
  // Returns top most resolved IPv4 address if address is resolved successfully.
  // Otherwise returns address set in SetAddress.
  SocketAddress address() const {
    SocketAddress addr;
    GetResolvedAddress(AF_INET, &addr);
    return addr;
  }

  // This signal is fired when address resolve process is completed.
  sigslot::signal1<AsyncResolverInterface*> SignalDone;
};

}  // namespace vz

#endif
